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477 lines (405 loc) · 14.7 KB
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# -*- coding: utf-8 -*-
# MinIO Python Library for Amazon S3 Compatible Cloud Storage, (C)
# 2020 MinIO, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Common request/response configuration of S3 APIs."""
# pylint: disable=invalid-name
from __future__ import absolute_import
import datetime
from abc import ABCMeta
from .error import MinioException
from .helpers import quote
from .sse import SseCustomerKey
from .time import to_http_header
from .xml import SubElement, find, findall, findtext
COPY = "COPY"
REPLACE = "REPLACE"
DISABLED = "Disabled"
ENABLED = "Enabled"
GOVERNANCE = "GOVERNANCE"
COMPLIANCE = "COMPLIANCE"
_MAX_KEY_LENGTH = 128
_MAX_VALUE_LENGTH = 256
_MAX_OBJECT_TAG_COUNT = 10
_MAX_TAG_COUNT = 50
class Tags(dict):
"""dict extended to bucket/object tags."""
def __init__(self, for_object=False):
self._for_object = for_object
super().__init__()
def __setitem__(self, key, value):
limit = _MAX_OBJECT_TAG_COUNT if self._for_object else _MAX_TAG_COUNT
if len(self) == limit:
raise ValueError(
"only {0} {1} tags are allowed".format(
limit, "object" if self._for_object else "bucket",
),
)
if not key or len(key) > _MAX_KEY_LENGTH or "&" in key:
raise ValueError("invalid tag key '{0}'".format(key))
if value is None or len(value) > _MAX_VALUE_LENGTH or "&" in value:
raise ValueError("invalid tag value '{0}'".format(value))
super().__setitem__(key, value)
@classmethod
def new_bucket_tags(cls):
"""Create new bucket tags."""
return cls()
@classmethod
def new_object_tags(cls):
"""Create new object tags."""
return cls(True)
@classmethod
def fromxml(cls, element):
"""Create new object with values from XML element."""
elements = findall(element, "Tag")
obj = cls()
for tag in elements:
key = findtext(tag, "Key", True)
value = findtext(tag, "Value", True)
obj[key] = value
return obj
def toxml(self, element):
"""Convert to XML."""
for key, value in self.items():
tag = SubElement(element, "Tag")
SubElement(tag, "Key", key)
SubElement(tag, "Value", value)
return element
class Tag:
"""Tag."""
def __init__(self, key, value):
if not key:
raise ValueError("key must be provided")
if value is None:
raise ValueError("value must be provided")
self._key = key
self._value = value
@property
def key(self):
"""Get key."""
return self._key
@property
def value(self):
"""Get value."""
return self._value
@classmethod
def fromxml(cls, element):
"""Create new object with values from XML element."""
element = find(element, "Tag")
key = findtext(element, "Key", True)
value = findtext(element, "Value", True)
return cls(key, value)
def toxml(self, element):
"""Convert to XML."""
element = SubElement(element, "Tag")
SubElement(element, "Key", self._key)
SubElement(element, "Value", self._value)
return element
class AndOperator:
"""AND operator."""
def __init__(self, prefix=None, tags=None):
if prefix is None and not tags:
raise ValueError("at least prefix or tags must be provided")
self._prefix = prefix
self._tags = tags
@property
def prefix(self):
"""Get prefix."""
return self._prefix
@property
def tags(self):
"""Get tags."""
return self._tags
@classmethod
def fromxml(cls, element):
"""Create new object with values from XML element."""
element = find(element, "And")
prefix = findtext(element, "Prefix")
tags = (
None if find(element, "Tag") is None
else Tags.fromxml(element)
)
return cls(prefix, tags)
def toxml(self, element):
"""Convert to XML."""
element = SubElement(element, "And")
if self._prefix is not None:
SubElement(element, "Prefix", self._prefix)
if self._tags is not None:
self._tags.toxml(element)
return element
class Filter:
"""Lifecycle rule filter."""
def __init__(self, and_operator=None, prefix=None, tag=None):
valid = (
(and_operator is not None) ^
(prefix is not None) ^
(tag is not None)
)
if not valid:
raise ValueError("only one of and, prefix or tag must be provided")
self._and_operator = and_operator
self._prefix = prefix
self._tag = tag
@property
def and_operator(self):
"""Get AND operator."""
return self._and_operator
@property
def prefix(self):
"""Get prefix."""
return self._prefix
@property
def tag(self):
"""Get tag."""
return self._tag
@classmethod
def fromxml(cls, element):
"""Create new object with values from XML element."""
element = find(element, "Filter")
and_operator = (
None if find(element, "And") is None
else AndOperator.fromxml(element)
)
prefix = findtext(element, "Prefix")
tag = None if find(element, "Tag") is None else Tag.fromxml(element)
return cls(and_operator, prefix, tag)
def toxml(self, element):
"""Convert to XML."""
element = SubElement(element, "Filter")
if self._and_operator:
self._and_operator.toxml(element)
if self._prefix is not None:
SubElement(element, "Prefix", self._prefix)
if self._tag is not None:
self._tag.toxml(element)
return element
class BaseRule:
"""Base rule class for Replication and Lifecycle."""
__metaclass__ = ABCMeta
def __init__(self, rule_filter=None, rule_id=None):
if rule_id is not None:
rule_id = rule_id.strip()
if not rule_id:
raise ValueError("rule ID must be non-empty string")
if len(rule_id) > 255:
raise ValueError("rule ID must not exceed 255 characters")
self._rule_filter = rule_filter
self._rule_id = rule_id
@property
def rule_filter(self):
"""Get replication rule filter."""
return self._rule_filter
@property
def rule_id(self):
"""Get rule ID."""
return self._rule_id
@staticmethod
def parsexml(element):
"""Parse XML and return filter and ID."""
return (
None if find(element, "Filter") is None
else Filter.fromxml(element)
), findtext(element, "ID")
def toxml(self, element):
"""Convert to XML."""
if self._rule_filter:
self._rule_filter.toxml(element)
if self._rule_id is not None:
SubElement(element, "ID", self._rule_id)
return element
def check_status(status):
"""Validate status."""
if status not in [ENABLED, DISABLED]:
raise ValueError("status must be 'Enabled' or 'Disabled'")
class ObjectConditionalReadArgs:
"""Base argument class holds condition properties for reading object."""
__metaclass__ = ABCMeta
def __init__(self, bucket_name, object_name, region=None, version_id=None,
ssec=None, offset=None, length=None, match_etag=None,
not_match_etag=None, modified_since=None,
unmodified_since=None):
if ssec is not None and not isinstance(ssec, SseCustomerKey):
raise ValueError("ssec must be SseCustomerKey type")
if offset is not None and offset < 0:
raise ValueError("offset should be zero or greater")
if length is not None and length <= 0:
raise ValueError("length should be greater than zero")
if match_etag is not None and match_etag == "":
raise ValueError("match_etag must not be empty")
if not_match_etag is not None and not_match_etag == "":
raise ValueError("not_match_etag must not be empty")
if (
modified_since is not None and
not isinstance(modified_since, datetime.datetime)
):
raise ValueError("modified_since must be datetime.datetime type")
if (
unmodified_since is not None and
not isinstance(unmodified_since, datetime.datetime)
):
raise ValueError("unmodified_since must be datetime.datetime type")
self._bucket_name = bucket_name
self._object_name = object_name
self._region = region
self._version_id = version_id
self._ssec = ssec
self._offset = offset
self._length = length
self._match_etag = match_etag
self._not_match_etag = not_match_etag
self._modified_since = modified_since
self._unmodified_since = unmodified_since
@property
def bucket_name(self):
"""Get bucket name."""
return self._bucket_name
@property
def object_name(self):
"""Get object name."""
return self._object_name
@property
def region(self):
"""Get region."""
return self._region
@property
def version_id(self):
"""Get version ID."""
return self._version_id
@property
def ssec(self):
"""Get SSE-C."""
return self._ssec
@property
def offset(self):
"""Get offset."""
return self._offset
@property
def length(self):
"""Get length."""
return self._length
@property
def match_etag(self):
"""Get match ETag condition."""
return self._match_etag
@property
def not_match_etag(self):
"""Get not-match ETag condition."""
return self._not_match_etag
@property
def modified_since(self):
"""Get modified since condition."""
return self._modified_since
@property
def unmodified_since(self):
"""Get unmodified since condition."""
return self._unmodified_since
def gen_copy_headers(self):
"""Generate copy source headers."""
copy_source = quote("/" + self._bucket_name + "/" + self._object_name)
if self._version_id:
copy_source += "?versionId=" + quote(self._version_id)
headers = {"x-amz-copy-source": copy_source}
if self._ssec:
headers.update(self._ssec.copy_headers())
if self._match_etag:
headers["x-amz-copy-source-if-match"] = self._match_etag
if self._not_match_etag:
headers["x-amz-copy-source-if-none-match"] = self._not_match_etag
if self._modified_since:
headers["x-amz-copy-source-if-modified-since"] = (
to_http_header(self._modified_since)
)
if self._unmodified_since:
headers["x-amz-copy-source-if-unmodified-since"] = (
to_http_header(self._unmodified_since)
)
return headers
class CopySource(ObjectConditionalReadArgs):
"""A source object defintion for copy_object method."""
@classmethod
def of(cls, src):
"""Create CopySource from another source."""
return cls(
src.bucket_name, src.object_name, src.region, src.version_id,
src.ssec, src.offset, src.length, src.match_etag,
src.not_match_etag, src.modified_since, src.unmodified_since,
)
class ComposeSource(ObjectConditionalReadArgs):
"""A source object defintion for compose_object method."""
def __init__(self, bucket_name, object_name, region=None, version_id=None,
ssec=None, offset=None, length=None, match_etag=None,
not_match_etag=None, modified_since=None,
unmodified_since=None):
super().__init__(
bucket_name, object_name, region, version_id, ssec, offset, length,
match_etag, not_match_etag, modified_since, unmodified_since,
)
self._object_size = None
self._headers = None
def _validate_size(self, object_size):
"""Validate object size with offset and length."""
def make_error(name, value):
ver = ("?versionId="+self._version_id) if self._version_id else ""
return ValueError(
"Source {0}/{1}{2}: {3} {4} is beyond object size {5}".format(
self._bucket_name,
self._object_name,
ver,
name,
value,
object_size,
)
)
if self._offset is not None and self._offset >= object_size:
raise make_error("offset", self._offset)
if self._length is not None:
if self._length > object_size:
raise make_error("length", self._length)
offset = self._offset or 0
if offset+self.length > object_size:
raise make_error("compose size", offset+self._length)
def build_headers(self, object_size, etag):
"""Build headers."""
self._validate_size(object_size)
self._object_size = object_size
headers = self.gen_copy_headers()
headers["x-amz-copy-source-if-match"] = self._match_etag or etag
self._headers = headers
@property
def object_size(self):
"""Get object size."""
if self._object_size is None:
raise MinioException(
"build_headers() must be called prior to "
"this method invocation",
)
return self._object_size
@property
def headers(self):
"""Get headers."""
if self._headers is None:
raise MinioException(
"build_headers() must be called prior to "
"this method invocation",
)
return self._headers.copy()
@classmethod
def of(cls, src):
"""Create ComposeSource from another source."""
return cls(
src.bucket_name, src.object_name, src.region, src.version_id,
src.ssec, src.offset, src.length, src.match_etag,
src.not_match_etag, src.modified_since, src.unmodified_since,
)